The use of `do-release-upgrade is bump` you to the next release (
or next LTS if available); so currently that's
groovy or 20.10 for you, not 21.04 or
impish (though any time now
groovy will disappear due EOL)... You can only upgrade to
impish if you're on the
lastest stable release, ie. currently you need to be on 21.04 which you are not.
Many of us upgrade to the
development release, however you become off-topic at many support sites (you need to use #ubuntu+1 sites) so yes it works; I'm on
impish myself - but you get there from the prior release; ie. I was on
hirsute or 21.04 before I
bumped to
impish. You cannot skip releases; except from one LTS to the next LTS
after the .1 has been released; ie. you'll be able to go from 20.04 to 22.04 after 22.04.1 has been released; that's the only
fully & QA-tested release path outside of all releases.
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